Disagree, some steroids suppress more than others; studies have shown this time and time again. Dbol 30mg will hardly any substantial effect on serum testosterone levels. Same applies to Var, Tbol and Winstrol at reasonable dosages.
Now heavy androgens like Deca, Test, Tren, Sdrol will suppress your production, but that's dose depended. And shutdown isn't even a thing, there's suppression but shutdown isn't a thing. Steroids were once thought to be the key to male birth control pill but scientist quickly realised sperm production nearly always occur even in the face of androgen usage, the quality and quantity is lowered but it's always there.
PCT isn't a MUST but it's somewhathelpful. PCT are more dangerous than the steroids themselves, Nolva effects liver and heart and improper usage of clomid can mess up your vision. PCT is poison in my eyes. Either blast and cruise, you just hop off and allow body to return to homoeostasis. Arnold, Nubret, Frank Zane, Mike Mizters and others before PCT become a thing, run grams of gear yet all fathered numerous children and lived past 70,